Method for suppressing steam turbine for geothermal power generation from scaling

Abstract

The invention relates to a method for suppressing a steam turbine for geothermal power generation from scaling. The method comprises the following steps of: connecting the steam turbine for geothermal power generation with one end of a three-way valve, and connecting the other end of the three-way valve with a geothermal steam pipeline through a geothermal steam pipeline control valve; connecting the third end of the three-way valve with a pure water steam pipeline control valve, a steam storage pot and a steam generator; vaporizing pure water through the steam generator to obtain pure steam and concentrating the pure steam into the steam storage pot; and controlling the on-off of the geothermal steam pipeline control valve and the pure steam pipeline control valve by utilizing a coordinated control loop to ensure that geothermal steam and pure water steam are alternately introduced into the steam turbine for geothermal power generation. In the invention, the pure water steam is alternately introduced, thereby the steam purity is improved, the continuous stable state of a steam chamber, a steam turbine nozzle and the surface of a moving blade is broken, and the scaling in the steam turbine nozzle, the surface of the moving blade and the whole steam chamber is suppressed; scales can be scoured; and the effect for suppressing scaling can be better with higher frequency and longer persistent acting time.

Description

technical field [0001] The invention relates to a method for inhibiting scaling, in particular to a method for inhibiting scaling of a steam turbine for geothermal power generation. Background technique [0002] When the geothermal steam drives the steam turbine for power generation, the thermal energy of the geothermal steam is converted into kinetic energy in the nozzle of the steam turbine, and then when the geothermal steam flows through the moving blades, it pushes the turbine impeller to rotate to do work, and this part of the kinetic energy of the geothermal steam is converted into mechanical energy . [0003] Geothermal steam refers to steam extracted from geothermal wells or saturated steam produced by steam-water separators or expanders. Based on the fact that geothermal steam comes from underground, many geothermal steams contain corrosive H 2 S, CO 2 and impurities such as boron, silica, iron, sodium and chlorine. Because the temperature and pressure of geoth...

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Problems solved by technology

[0011] Descaling with cleaning agent requires shutdown treatment; high-voltage static descaling is only for the descaling of the cooling pipe of the auxiliary condenser of the steam turbine; it partially acts on the nozzle and its anti-scaling of the geothermal steam turbine, and does not involve other things such as moving blades and steam chambers Part; the pre-cleaning treatment of geothermal steam, although the elimination of chloride ions and other impurities has been fully considered, but due to the influence of the utilization rate of geothermal steam and the working parameters of the steam turbine for geothermal power generation, there are few solubility and silicon and silicon that may be caused by temperature drop. Precipitation of silicates, scaling on the surface of steam turbine nozzles and moving blades will still occur; while improving geothermal steam turbine rotor blades, nozzles and steam turbine rotors and other components can only resist corrosion and erosion, not inhibit or prevent scaling. When the fouling of the steam turbine is serious, it will have a great impact on the reliability of the steam turbine for geothermal power generation

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